Prime Factors, gCD, lCM description

With this application you can do a lot of thinks with mathematics:
- You can find out if an integer is a prime number or not (and you have in fact no limit: you can do this for numbers until thousands og billions)
- You can decompose into prime factors all the integers
- You can find out gCD / gCF (Greatest Common Divisor), lCM (Least Common Multiple)
- You can learn how to calculate gCD and lCM in very nice way.

Your Math could be easy and nice.